Add rebar dep

[tsloughter]

No description provided.

[codecov]

Codecov Report

Merging #146 (2e9c432) into master (b5e6b65) will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #146      +/-   ##
==========================================
+ Coverage   32.27%   32.33%   +0.06%     
==========================================
  Files          62       62              
  Lines        3145     3145              
==========================================
+ Hits         1015     1017       +2     
+ Misses       2130     2128       -2     

Flag	Coverage Δ
api	50.22% <ø> (ø)
elixir	14.28% <ø> (ø)
erlang	32.19% <ø> (+0.06%)	⬆️
exporter	18.02% <ø> (ø)
sdk	67.20% <ø> (+0.32%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
apps/opentelemetry/src/otel_batch_processor.erl	75.00% <0.00%> (+2.27%)	⬆️

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[tsloughter]

This will resolve #140